Corrugated bar.



PATBNTBD AUG- 6, 1907.

Q A. L. JOHNSON.

CORRUGATED BAR. APPLIOATION FILED NOV. 15,1906.

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UNITED STATES PATENT OFFICE.

ALBERT JOHNSON, OF ST. LOUIS, MISSOURI.

CORRUGATED BAR.

' forcing concrete, in which the face of the bar is provided with aseries of alternate ribs and depressions so arranged and inclined thatin any right section, the .ribs and depressions of-each' face willreciprocally compensate and leave the area of the right section constantthroughout the length of the barl In that arrangement, the angle ofinclination of the ribs is a function of the width of the ribs, thelongitudinal displacement of a point at one end of the rib from theplane of the similar point in the other end being substantially equal totwice the width of therib.

The object of the present invention is to decrease this angle ofinclination so as to make theribs lie more nearly perpendicular to theaxis of the bar and still require that a plane passing through adepression in one face must pass through a rib in the opposite face. Forthis purpose, the series of alternating ribs and depressions on one sideof the bar is definitely correlated to the series of alternating ribsand depressions on the opposite side of the bar, so that the reciprocalcompensation of ribs and depressions required to producea constantsection is effected by the cooperation of such opposite series.

I The invention consists in the arrangements and combinations of partshereinafter described.

In the accompanying drawing, which forms part of this specification, andwherein like symbols refer to like parts wherever they occur, Figure lis a view of a wide face of a flat bar embodying my invention, with theribs of the opposite face indicated in dotted lines; Fig. 2 is an edgeview of the flat bar illustrated in Fig. l, the lower portion of the barbeing shown in section along the line 22 of Fig. 1 Figs. 3, 4 and 5, arecross sections on the lines 3-;3, 4-4 and 5-5, respectively, of Fig. 1;Fig. 6 is a diagrammatic view or development of the surfaces of the foursides of the bar, which surfaces are assumed to be folded back into asingle plane in order to illustrate the correlation of the ribs anddepression of one face with the ribs and depressions of the oppositeface.

In the present construction, each of two opposite sides or faces of thebar is provided with a series of alternate parallel ribs 1 anddepressions or intervening spaces 2 arranged transversely but inclinedat an angle to the axis of the bar. The ribs of each series are of analwidth and are spaced apart a distance nearly equal to their width andare inclined at such an angle that the initial point (a) in the medialline of a rib shall Specification of Letters Patent. A lication fil dNovember 16,1906. s ri l No- 343.549.

Patented. Aug. 6, 1907.

lie in the same plane (44, Fig. 1) perpendicular to the axis of the baras the final point b of the medial line of the. next adjacentdepression: or, in other words, the

final point e of the rear shoulder of one rib shalllie in the same rightsection (33, Fig. 1)'with the initial point d of the forward shoulder ofthe next adjacent rib. The ribs and depressions of one face have thesame width as the ribs and depressions of the opposite face, and theangle of inclination of the two series 'of ribs has the same numericalvalue. The initial point e in the medial line of the shoulder of each ofthe ribs in one side or face is arranged in substantially the sametransverseplane or right section as the final point f of thecorresponding shoulder of the corresponding depression of the oppositeface. By this arrangement, the ribs of one face are of the same size andshape as the spaces of the opposite face, and their arrangement is suchthat at whatever point a right section may-be taken, the cross sectionalarea of the space irr'the one face is equal to the cross sectional areaof the rib in the opposite face; or, in other words, the ribs in oneface compensate for the spaces in the opposite face and vice versa, sothat the right sectional area of the bar is substantially uniformthroughout its length. It is noted, that so far as the cross-sectionalarea of a right section is concerned, the bars of one face may inclinein the same direction or crosswise without changing the uniformity orconstancy of the cross-sectional area. In either case, correspondingpoints in the medial lines of opposite ribs and depressions, thatis,points in such medial lines equidistant from the ends thereof, lie inthe same plane perpendicular to the axis of the bar. When the ribs ofone face are inclined crosswise or inversely to the ribs of the oppositeface, as indicated in dotted lines in Fig. 1, the forces tending to movethe bar laterally are neutralized.- For the purpose of resisting lateralmovement, and also to strengthen the bar, it is desirable to make thedepressions terminate short of the margins of the bar, whereby a fillet3 is formed along such margin. In actual practice, the ribs should bemade slightly Wider than the spaces between them in order to guardagainst lack of precision in the process of manufacture. Otherwise, thetwo opposite faces of the bar are counterparts. Obviously, the inventionmay be embodied in square bars or bars of other shapes, and I do notwish to be restricted to the construction illustrated. 7 What I claim asmy invention and desire to secure by Letters Patent is:

1. A bar for reinfo. cing concrete having on each of two opposite facesa series of transversely inclined parallel ribs and depressions, theends of the ribs 011 one face being opposite the ends of depressions inthe opposite face and the ribs being slightly wider than thedepressions, whereby the ribs on one face are arranged to compensate forthe depressions in the opposite face, and whereby thecross-sectionatarea of the bar is substantially uniform throughout itslength.

2. A bar for reinforcing concrete having on each of two opposite faces aseries of transversely inclined parallel ribs and depressions, the endsof the ribs on one face being opposite the ends of depressions in theopposite face and the ribs being slightly wider than the depressions,whereby the ribs on each of said faces are arranged" to compensate forthe depressions in the opposite face and the depressions'terminatingshort of the margin of the bar.

3. A bar for relnforcingconcrete having two opposite substantiallycounterpart faces, each of said faces having a series of parallel ribsand depressions, the initial point in the medial line of a rib being inthe same plane perpendicular to the axis of the bar as the final pointin the medial line of the next adjacent depression of the same face andas the final point of the medial line of the corresponding depressioninthe opposite face.

4. A bar for reinforcing concrete having two opposite substantiallycounterpart faces, each of said faces having a series of transverselyinclined parallel ribs and depressions, the ribs on each face beingslightly wider than the respective depressions-in the opposite face, andcorresponding points in the medial lines of opposite ribs anddepressions lying in the same plane perpendicular to the axis of thebar.

each 'of two opposite faces a series of transversely inclined parallelribs anddepressions, the'ends of the ribs on one face being opposite theends of depressions in the opposite face and the ribs being slightlywider than the depres' sions, whereby the ribs on one face are arrangedto compensate for the depressions in the opposite face, and whereby thecross-sectional area of the bar is substantially uniform throughout itslength, the inclination of the ribs on one face being the same in amountas the inclination of the ribs on the opposite face but of inversedirection.

5. A rectangular bar for reinforcing concrete having on 6. A rectangularbar for reinforcing concrete having on each of two opposite faces aseries of transversely inclined parallel ribs and depressions, the ribson one face being arranged to compensate for the depressions in theopposite face, the ribs on opposite faces having the same amount ofinclination, and the initial points of the medial lines of a rib on oneface and the corresponding depression in the opposite face being in thesame plane perpem dicular to the axis of the bar. I

7. A rectangular bar for reinforcing concrete having two oppositesubstantially counterpart faces, each of said faces having a series ofparallel ribs and depressionathe initial point in the medial line of arib being in the same plane perpendicular -to the axis 'of thebar as theline! point in the medial line of the next adjacent rib of the same faceand as the initialpoint of the medial line of the correspondingdepression in the opposite face, the domes sions terminating short ofthe margins of the bar.

8. A fiat bar for reinforcing concrete having on each of two oppositefaces a series of transversely inclined parallel ribs and depressions,the ends of the ribs on one face being opposite the ends of depressionsin the oppositeface and ALBERT L. JOHNSONW Witnesses Hanson C. Coxn,Y.'FAUBANT.

